CN113497526A

CN113497526A - Cooling device for rotating electrical machine for vehicle

Info

Publication number: CN113497526A
Application number: CN202110307601.7A
Authority: CN
Inventors: 村上幸范; 柴田僚介
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2020-04-08
Filing date: 2021-03-23
Publication date: 2021-10-12
Also published as: JP2021168527A; US20210320544A1

Abstract

The present invention relates to a cooling device for a rotating electrical machine for a vehicle. The second wire harness passing below the cooling pipe is restricted by the restricting member at a position not overlapping with a plane passing through the cooling oil hole and perpendicular to the long dimension direction of the cooling pipe, and therefore, even if the second wire harness is not arranged above the cooling pipe, the cooling oil fed out from the cooling oil hole is prevented from being caught on the second wire harness. Therefore, the cooling oil that is discharged from the cooling oil hole is efficiently supplied to the first rotating electrical machine, and therefore the cooling performance of the first rotating electrical machine is improved.

Description

Cooling device for rotating electrical machine for vehicle

Technical Field

The present invention relates to a cooling device for a vehicle rotating electrical machine provided in a vehicle, and more particularly to a cooling device having a structure in which a vehicle rotating electrical machine is cooled by cooling oil discharged from a cooling pipe disposed above the vehicle rotating electrical machine.

Background

A structure has been proposed in which a cooling pipe parallel to the rotation axis of a rotating electrical machine (hereinafter, rotating electrical machine) for a vehicle provided in a vehicle is disposed above the rotating electrical machine, and cooling oil is discharged from the cooling pipe to a stator and a rotor constituting the rotating electrical machine, thereby cooling the rotating electrical machine. This is true of the cooling structure of the rotary electric machine of japanese patent laid-open publication No. 2019-75859. In japanese patent application laid-open No. 2019 and No. 75859, two cooling pipes having different supply sources are disposed above a rotating electrical machine, and cooling oil is stably supplied to the rotating electrical machine, thereby improving the cooling performance of the rotating electrical machine.

In general, a stator constituting a rotating electric machine is connected to a Power Control Unit (PCU) outside a case via a wire harness (W/H), and when cooling oil is hung on the wire harness, cooling efficiency of a rotor and the stator is lowered. Therefore, it is conceivable to arrange the wire harness so as to pass above the cooling pipe, but as the case housing the rotating electrical machine is made smaller, the distances between the stator, the cooling pipe, and the case are reduced, and therefore it becomes difficult to arrange the wire harness so as to pass above the cooling pipe. Further, not only the wire harness connected to the stator, but also the wire contained in the case needs to be passed through the lower portion of the cooling pipe, cooling oil discharged from the cooling pipe may be caught on the wire harness, and cooling performance of the rotor and the stator may be deteriorated.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a structure for preventing coolant from being caught by a wire passing through a lower portion of a cooling pipe in a cooling device for a rotary electric machine for a vehicle, the cooling device having a structure for cooling the rotary electric machine for a vehicle by the coolant discharged from the cooling pipe disposed above the rotary electric machine for a vehicle.

The gist of the first aspect of the present invention is (a) a cooling device for a rotating electrical machine for a vehicle, which is applied to a rotating electrical machine for a vehicle that is accommodated in a case and is configured to include a stator and a rotor, the cooling device including a cooling pipe that is elongated, a cooling pipe disposed above the stator and the rotor in a direction of a vertical line in a vehicle-mounted state and along a rotation axis of the rotor, wherein the cooling pipe is provided with a restriction member, and wherein the cooling pipe is provided with a cooling liquid discharge hole formed in the cooling pipe, and wherein the cooling liquid supplied to the cooling pipe is discharged to at least one of the stator and the rotor through the cooling liquid discharge hole, the restricting member restricts relative movement of the wire passing below the cooling pipe in the longitudinal direction with respect to the cooling pipe to a position not overlapping a plane passing through the coolant escape hole and perpendicular to the longitudinal direction of the cooling pipe.

A second aspect of the invention provides the cooling device of a rotating electrical machine for a vehicle recited in the first aspect of the invention, wherein the restricting member is an L-shaped member that is provided at a position that does not overlap a plane that passes through the coolant discharge hole and is perpendicular to a longitudinal direction of the cooling pipe, and that catches the wiring.

According to the cooling device for a rotating electrical machine for a vehicle of the first aspect of the invention, the wire passing below the cooling pipe is restricted by the restricting member to the position not overlapping the plane passing through the coolant discharge hole and perpendicular to the longitudinal direction of the cooling pipe, and therefore, even if the wire is not arranged above the cooling pipe, the coolant discharged from the coolant discharge hole is prevented from catching on the wire. Therefore, the coolant discharged from the coolant discharge hole is efficiently supplied to the rotating electric machine for a vehicle, and therefore the cooling performance of the rotating electric machine for a vehicle is improved.

According to the cooling device for a rotating electrical machine for a vehicle of the second aspect of the invention, the wire passing below the cooling pipe is caught by the L-shaped member serving as the regulating member, and the wire is prevented from moving below the coolant discharge hole, so that the coolant is prevented from being caught by the wire.

Drawings

Features, advantages and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, wherein like reference numerals denote like elements, and wherein:

fig. 1 is a skeleton diagram schematically showing a configuration of a hybrid vehicle to which the present invention is applied.

Fig. 2 is a schematic diagram schematically showing a cooling device for cooling the first rotating electric machine.

Fig. 3 is a view showing an internal structure of a motor chamber in the power transmission device of fig. 1.

Fig. 4 is an enlarged view showing an upper structure of the first rotating electric machine shown in fig. 3.

Fig. 5 is a perspective view for explaining the structure of the cooling pipe.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, the drawings are simplified or modified as appropriate, and the dimensional ratios, shapes, and the like of the respective portions are not necessarily drawn accurately.

Fig. 1 is a skeleton diagram schematically showing a configuration of a hybrid vehicle 8 (hereinafter referred to as a vehicle 8) to which the present invention is applied. The vehicle 8 includes a vehicle power transmission device 10 (hereinafter, referred to as a power transmission device 10) between an engine 12 and a pair of left and right drive wheels 14l and 14r (hereinafter, referred to as drive wheels 14 without distinction). The power transmission device 10 is preferably used for an FF (front engine/front wheel drive) type hybrid vehicle. The power transmission device 10 is a hybrid type power transmission device that transmits power output from the engine 12 and the second rotating electric machine MG2 as driving force sources for running to a pair of left and right drive wheels 14l, 14 r. In the present specification, the motive force is synonymous with the torque and the driving force.

As shown in fig. 1, the power transmission device 10 includes an input shaft 23 arranged to be rotatable about a first rotation axis line CL1, a planetary gear device 24, a first rotating electrical machine MG1, and an output gear 26. The power transmission device 10 includes a power transmission shaft 34 disposed to be rotatable about the second rotation axis line CL2, a second rotating electrical machine MG2, and a reduction gear 36 provided on the power transmission shaft 34. The power transmission device 10 includes a counter shaft 32 disposed to be rotatable about the third rotation axis line CL3, a counter gear 28 provided on the counter shaft 32, and a differential drive gear (differential drive gear) 30. Further, the power transmission device 10 includes the differential device 20 and the axles 22l and 22r arranged to be rotatable about the fourth rotation axis CL 4. Each of the rotating members is accommodated inside a case 40 as a non-rotating member. The first to fourth rotation axes CL1 to CL4 are rotation axes arranged parallel to the vehicle width direction of the vehicle 8.

The first rotating electrical machine MG1 and the second rotating electrical machine MG2 are rotating electrical machines having at least one of a function as an engine that generates mechanical power from electrical energy and a function as a generator that generates electrical energy from mechanical power, and are preferably motor generators that selectively operate as an engine or a generator. The first rotating electrical machine MG1 has a power generation (generator) function for receiving a reaction force of the engine 12 and a rotating electrical machine (motor) function for rotating the engine 12 during a stop of operation. The second rotating electric machine MG2 has a rotating electric machine function for functioning as a rotating electric machine for running that outputs a driving force as a driving force source for running, and a power generation function for generating electric power by regeneration from a reverse driving force from the driving wheels 14.

The input shaft 23 is coupled to the engine 12 via a crankshaft 12a of the engine 12 and a damper or the like, not shown, so as to be capable of transmitting power. The input shaft 23 is supported by the case 40 via a bearing 18 or the like so as to be rotatable about the first rotation axis CL 1.

The planetary gear device 24 is arranged so as to be centered on the first rotation axis CL1, and is configured by a single-pinion planetary gear device (differential mechanism) having a sun gear S, a carrier (carrier) CA, and a ring gear R. The planetary gear device 24 functions as a power distribution mechanism that distributes the power of the engine 12 to the first rotating electrical machine MG1 and the output gear 26. The sun gear S of the planetary gear device 24 is coupled to the first rotating electric machine MG1 so as to be able to transmit power, the carrier CA is coupled to the engine 12 so as to be able to transmit power via the input shaft 23 and the crankshaft 12a, and the ring gear R is coupled to the output gear 26 so as to be able to transmit power. The ring gear R and the output gear 26 are formed of a compound gear in which these gears are integrally formed.

The first rotating electrical machine MG1 is disposed at a position adjacent to the planetary gear device 24 with a partition wall 56 as a part of the case 40 interposed therebetween in the first rotation axis CL1 direction. The first rotating electrical machine MG1 includes: a cylindrical stator 42 fixed to the case 40 so as not to be rotatable; a cylindrical rotor 44 disposed on the inner peripheral side of the stator 42; and a rotor shaft 46 coupled to an inner periphery of the rotor 44. A stator coil 48 is wound around the stator 42. The rotor shaft 46 is rotatably supported by the housing 40 via a pair of bearings 47a and 47b disposed on both sides in the axial direction.

The output gear 26 is coupled to the ring gear R of the planetary gear device 24, and meshes with a counter gear 28 provided on a counter shaft 32.

The second rotating electrical machine MG2 and the reduction gear 36 are disposed so as to be rotatable about the second rotation axis CL2, and are disposed at positions adjacent to each other with the partition wall 56 interposed therebetween in the direction of the second rotation axis CL 2. The second rotating electrical machine MG2 and the reduction gear 36 are connected to each other via the power transmission shaft 34 so as to be capable of transmitting power.

The second rotating electrical machine MG2 includes: a cylindrical stator 50 fixed to the case 40 so as not to be rotatable; a cylindrical rotor 52 disposed on the inner peripheral side of the stator 50; and a rotor shaft 54 coupled to an inner periphery of the rotor 52. A stator coil 55 is wound around the stator 50. The rotor shaft 54 is rotatably supported by the housing 40 via a pair of

bearings

57a and 57b disposed on both sides in the axial direction.

The reduction gear 36 is integrally provided on the power transmission shaft 34, and meshes with the counter gear 28 provided on the counter shaft 32. The number of teeth of the reduction gear 36 is set to be smaller than the number of teeth of the counter gear 28, and thus the rotation of the second rotating electrical machine MG2 is reduced by the reduction gear 36 and the counter gear 28 and transmitted to the counter shaft 32. The power transmission shaft 34 is rotatably supported by the case 40 via a pair of

bearings

59a and 59b disposed on both sides in the axial direction.

The counter shaft 32 is rotatably supported by the case 40 via a pair of

bearings

61a and 61b disposed on both sides in the axial direction.

The counter gear 28 and the differential drive gear 30 are provided on the counter shaft 32 that rotates about the third rotation axis CL3 so as to be relatively non-rotatable. The counter gear 28 meshes with the output gear 26 and the reduction gear 36, thereby transmitting power output from the engine 12 and the second rotating electrical machine MG 2. The differential drive gear 30 meshes with a differential driven gear 38 of the differential device 20. Therefore, when power is transmitted from at least one of the output gear 26 and the reduction gear 36 to the counter gear 28, the power is transmitted to the differential device 20 via the counter shaft 32 and the differential drive gear 30.

The differential device 20 and the pair of left and right axles 22l and 22r are arranged to be rotatable about the fourth rotation axis CL 4. The differential driven gear 38 of the differential device 20 meshes with the differential drive gear 30, and the power output from at least one of the engine 12 and the second rotating electrical machine MG2 is transmitted to the differential device 20 via the differential driven gear 38.

The differential device 20 is constituted by a well-known differential mechanism, and transmits power to the pair of left and right axles 22l, 22r while allowing relative rotation of the pair of left and right axles 22l, 22 r. The differential device 20 is rotatably supported by the case 40 via a pair of

bearings

62a and 62b disposed on both sides in the direction of the fourth rotation axis CL 4. The differential device 20 is a well-known technique, and therefore, the description thereof is omitted.

The case 40 is composed of a first case member 40a, a second case member 40b, and a third case member 40 c. Both sides of the second case member 40b in the first rotation axis line CL1 direction are open, the first case member 40a is fastened with a bolt to one opening of the second case member 40b, and the third case member 40c is fastened with a bolt to the other opening of the second case member 40 b.

The partition wall 56 perpendicular to the first rotation axis CL1 is formed in the second casing member 40 b. The inside of the case 40 is divided by a partition wall 56 into a gear chamber 58 and a motor chamber 60, the gear chamber 58 accommodates various gears such as the planetary gear device 24, the output gear 26, the counter gear 28, the reduction gear 36, and the differential device 20, and the motor chamber 60 accommodates the first rotating electric machine MG1 and the second rotating electric machine MG 2.

Further, a mechanical oil pump OP driven by the engine 12 is provided at an end portion of the input shaft 23 on the opposite side to the engine 12 in the axial direction on the first rotation axis CL 1. A not-shown drive gear that drives the oil pump OP is provided at a shaft end portion of the input shaft 23, and the oil pump OP is rotationally driven in conjunction with the rotation of the engine 12. Note that the oil pump OP is configured to pump up oil stored in a lower portion of the gear chamber 58.

In the power transmission device 10 configured as described above, the power of the engine 12 is transmitted to the left and right drive wheels 14l, 14r via the planetary gear device 24, the output gear 26, the counter gear 28, the counter shaft 32, the differential drive gear 30, the differential device 20, and the axles 22l, 22 r. The power of the second rotating electric machine MG2 is transmitted to the left and right drive wheels 14l, 14r via the rotor shaft 54, the power transmission shaft 34, the reduction gear 36, the counter gear 28, the counter shaft 32, the differential drive gear 30, the differential device 20, and the axles 22l, 22 r.

Fig. 2 is a schematic diagram schematically showing the structure of the cooling device 70 that cools the first rotating electric machine MG 1. In fig. 2, the upper side of the drawing corresponds to the upper side in the direction of the vertical line in the vehicle mounted state. The first rotating electrical machine MG1 corresponds to the rotating electrical machine for a vehicle according to the present invention.

Fig. 2 shows a part of the first rotating electrical machine MG1 accommodated in the motor chamber 60 formed in the case 40 in a sectional view. The first rotating electrical machine MG1 is disposed so as to be rotatable about a first rotation axis CL 1. The first rotating electrical machine MG1 includes a cylindrical rotor 44 and a cylindrical stator 42 disposed on the outer peripheral side of the rotor 44. The stator 42 and the rotor 44 are each configured by laminating a plurality of disc-shaped electromagnetic steel plates on the first rotation axis CL 1.

A plurality of slots formed in parallel with the first rotation axis CL1 are formed in the inner peripheral portion of the stator 42, and the stator coil 48 is wound through the slots. In connection with this, coil ends 72 formed by bundling stator coils 48 are disposed at both ends of first rotation axis CL1 of stator 42. The stator 42 includes a stator coil 48 wound around the stator 42.

When the first rotating electric machine MG1 is driven, the stator coil 48 is energized, and therefore the stator coil 48 generates heat. The heat generated by the stator coil 48 is radiated by conduction to the stator 42 and the like, but since the coil end 72 is not in contact with the stator 42, the heat is not easily radiated. In contrast, the cooling device 70 is disposed such that the cooling pipe 74 is disposed above the first rotating electric machine MG1 in the direction of the vertical line in the vehicle-mounted state, and the cooling oil is discharged from the cooling pipe 74 to the first rotating electric machine MG1, thereby cooling the first rotating electric machine MG 1. Note that the cooling oil corresponds to the cooling liquid of the present invention.

The cooling device 70 includes a cooling pipe 74 disposed above the first rotating electric machine MG1 in the direction of the vertical line. The cooling pipe 74 is formed of a tubular member having one end opened in the longitudinal direction. The cooling pipe 74 is disposed parallel to the first rotation axis CL1 so that the longitudinal direction thereof is along the first rotation axis CL 1. One end of the cooling pipe 74 in the longitudinal direction is fixed to the partition wall 56 of the second casing member 40b by a bolt 76. At the other end in the longitudinal direction of the cooling pipe 74, a projection 78 is formed, and the projection 78 is fitted into a recess 80 formed in the third case member 40c, whereby the rattling of the cooling pipe 74 is suppressed.

The cooling oil is supplied to the cooling pipe 74 from an opening at one end in the longitudinal direction indicated by an arrow. The cooling oil, for example, pumped up by the oil pump OP is supplied to the cooling pipe 74. The cooling pipe 74 is formed with a plurality of cooling oil holes 82 that communicate the inside of the pipe with the outside. The cooling oil holes 82 are formed at the same positions as the positions where the pair of coil ends 72 are arranged and at the same positions as the positions where the stator 42 is arranged in the longitudinal direction of the cooling pipe 74 (i.e., the direction of the first rotation axis CL 1). That is, the cooling oil holes 82 are formed at positions overlapping the pair of coil ends 72 and at positions overlapping the stator 42 when viewed in the radial direction about the first rotation axis CL1 in the longitudinal direction of the cooling pipe 74. Further, the cooling oil hole 82 is formed at a position below the direction of the perpendicular line in the circumferential direction of the cooling pipe 74, that is, at a position opposing the pair of coil ends 72 and the stator 42 to each other.

Since the cooling oil holes 82 are formed at the above-described positions of the cooling pipe 74, the cooling oil supplied to the cooling pipe 74 is discharged from the cooling oil holes 82 to the pair of coil ends 72 and the stator 42 as indicated by arrows, and the pair of coil ends 72 and the stator 42 are efficiently cooled. The cooling oil hole 82 corresponds to a cooling liquid discharge hole of the present invention.

Fig. 3 is a diagram showing an internal structure of the motor chamber 60 in the power transmission device 10, and corresponds to a diagram viewed from the direction of arrow B in a state where the third case member 40c is detached in fig. 1. In fig. 3, the upper side of the paper corresponds to the upper side in the direction of the vertical line in the vehicle mounted state, and the left side of the paper corresponds to the forward traveling direction. Fig. 4 is an enlarged view of a portion above the first rotating electric machine MG1 in fig. 3.

As shown in fig. 3, the first rotating electrical machine MG1 and the second rotating electrical machine MG2 are housed in the motor chamber 60. The first rotating electrical machine MG1 is configured to be rotatable about a first rotation axis CL1, and the second rotating electrical machine MG2 is configured to be rotatable about a second rotation axis CL 2. The first rotating electric machine MG1 is disposed on the traveling side of the second rotating electric machine MG2 in the vehicle traveling direction and below the second rotating electric machine MG2 in the direction of the vertical line.

A cooling pipe 74 that discharges cooling oil for cooling the first rotating electric machine MG1 is disposed above the first rotating electric machine MG1 in the direction of the vertical line in the vehicle-mounted state. The cooling pipe 74 is disposed forward of the second rotating electric machine MG2 in the vehicle traveling direction.

Three copper wires 84a to 84c connected to the three-phase windings of the stator coil 48 extend from the stator 42 of the first rotating electric machine MG 1. These copper wires 84a to 84c are connected to three-phase terminals 86a to 86c provided on partition wall 56 of second case member 40b, respectively.

Three copper wires 88a to 88c connected to the three-phase windings of the stator coil 55 extend from the stator 50 of the second rotating electric machine MG 2. These copper wires 88a to 88c are connected to three-phase terminals 90a to 90c provided on partition wall 56 of second case member 40b, respectively.

Further, a first harness 92 connected to a sensor connector 91 of a temperature sensor provided on the stator 42 of the first rotating electrical machine MG1 extends. One end of first harness 92 is connected to sensor connector 91 of the temperature sensor provided on stator 42, and the other end is connected to first connector 94 provided on partition wall 56 of second case member 40 b.

Further, a second wire harness 96 connected to a sensor connector 95 of a temperature sensor provided on the stator 50 of the second rotating electrical machine MG2 extends. One end of second harness 96 is connected to sensor connector 95 of the temperature sensor provided on stator 50, and the other end is connected to second connector 98 provided on partition wall 56 of second case member 40 b. The second harness 96 corresponds to the wiring of the present invention.

The first connector 94 and the second connector 98 are provided in the vicinity of a wall of the second case member 40b that encloses the first rotating electrical machine MG1 and the second rotating electrical machine MG 2. Further, the first connector 94 and the second connector 98 are arranged to abut each other. This enables the terminals connected to the first connector 94 and the second connector 98 to be integrated into one terminal. The first connector 94 and the second connector 98 are disposed above the cooling pipe 74 in the direction of the vertical line in the vehicle-mounted state. The first connector 94 and the second connector 98 are disposed on the forward direction side of the cooling pipe 74 in the vehicle traveling direction.

Since the first connector 94 and the second connector 98 are arranged at the above-described positions, the cooling pipe 74 is positioned between the second connector 98 and the second rotating electric machine MG2 in the vehicle traveling direction, and therefore the second harness 96 connecting between the second connector 98 and the second rotating electric machine MG2 needs to pass above or below the cooling pipe 74. In the present embodiment, it is necessary to pass the second harness 96 below the cooling pipe 74 as shown in fig. 3 according to the restrictions of the arrangement in the motor room 60 and the like.

Here, when the second harness 96 is passed under the cooling pipe 74, the cooling oil that has been discharged from the cooling oil holes 82 of the cooling pipe 74 may be caught by the second harness 96, and the amount of cooling oil necessary for cooling the first rotating electric machine MG1 may not be supplied to the first rotating electric machine MG1, resulting in insufficient cooling performance of the first rotating electric machine MG 1. Further, the cooling oil caught on the second wire harness 96 may move to the sensor connector 95 of the temperature sensor of the second rotating electrical machine MG2 and the second connector 98 along the second wire harness 96, and foreign matter contained in the cooling oil may adhere to these connectors.

In contrast, in the present embodiment, the position of the second wire harness 96 passing below the cooling pipe 74 is restricted so that the second wire harness 96 does not pass below the cooling oil hole 82 of the cooling pipe 74 in the direction of the vertical line, thereby preventing the cooling oil from being caught on the second wire harness 96.

Fig. 5 is a perspective view for explaining the structure of the cooling pipe 74. As shown in fig. 5, the cooling pipe 74 is constituted by a tubular member extending in the longitudinal direction. In fig. 5, the right side of the drawing corresponds to a portion fixed to the partition wall 56 of the second case member 40b by a bolt 76. On the other hand, the left side of the drawing corresponds to a portion fitted into a recess 80 (see fig. 1) formed in the third casing member 40 c.

As shown in fig. 5, a flange portion 100 extending radially outward is formed on one side (right side in the paper plane) of the cooling pipe 74 fixed to the partition wall 56 in the longitudinal direction. The flange portion 100 is formed with bolt holes 102 through which bolts 76 for fixing the cooling pipe 74 are inserted. One end of the cooling pipe 74 fixed to the partition wall 56 is fastened by the bolt 76 in a state of being inserted through a through hole 104 (see fig. 2) of the partition wall 56, whereby the cooling pipe 74 is fixed to the partition wall 56. The cooling oil is supplied to the inside of the cooling pipe 74 from an opening formed on the side fixed to the partition wall 56 in the longitudinal direction of the cooling pipe 74.

A projection 78 projecting in the longitudinal direction is formed on an end portion of the cooling pipe 74 opposite to the side fixed to the partition wall 56 (left side in the drawing) in the longitudinal direction. In the state where the third case member 40c is assembled, the projection 78 is fitted into the recess 80 formed in the third case member 40c, whereby the rattling of the cooling pipe 74 during the traveling of the vehicle is suppressed.

Cooling oil holes 82 that communicate the inside and outside of the pipe are formed in the cooling pipe 74, and cooling oil is discharged from the cooling oil holes 82 as indicated by arrows. Further, a restriction member 106 that restricts relative movement of the second wire harness 96 with respect to the cooling pipe 74 in the longitudinal direction is provided at a position different from the position where the cooling oil hole 82 is formed in the longitudinal direction of the cooling pipe 74, that is, at a position that does not overlap a plane L (see fig. 5) that passes through the cooling oil hole 82 and is perpendicular to the longitudinal direction of the cooling pipe 74.

The restriction member 106 is formed in an L-shape composed of a short side 108 and a long side 110. The short side 108 is formed to protrude from the cooling pipe 74 in a direction perpendicular to the longitudinal direction of the cooling pipe 74 (i.e., radially outward). The long side 110 extends from the tip of the short side 108 toward the protrusion 78, i.e., away from the cooling oil hole 82, along the longitudinal direction of the cooling pipe 74. The distal ends of the long sides 110 are inclined in a direction approaching the cooling tubes 74, and the size of the gap formed between the distal ends of the long sides 110 and the cooling tubes 74 is set smaller than the diameter of the second harness 96. Therefore, when the second wire harness 96 is inserted into the gap between the long side 110 and the cooling pipe 74, the second wire harness 96 is prevented from falling out of the gap.

A portion of the second harness 96 passing below the cooling pipe 74 is caught by the restricting member 106. In fig. 5, the one-dot chain line corresponds to the second wire harness 96. As shown in fig. 5, the second wire harness 96 passing below the cooling pipe 74 is fixed so as to be sandwiched between the cooling pipe 74 and the long side 110 of the restriction member 106.

With the above configuration, the relative movement of the second harness 96 passing below the cooling pipe 74 with respect to the cooling pipe 74 in the longitudinal direction is restricted. For example, when the second wire harness 96 moves relative to the cooling pipe 74 in the longitudinal direction toward the cooling oil hole 82 side, the second wire harness 96 is in contact with the short side 108 of the restriction member 106. Therefore, the relative movement of the second wire harness 96 with respect to the cooling pipe 74 in the longitudinal direction toward the cooling oil hole 82 side is restricted. Thus, the portion of the second wire harness 96 passing below the cooling pipe 74 is restricted to a position displaced from the cooling oil hole 82 in the longitudinal direction of the cooling pipe 74. In other words, the portion of the second wire harness 96 that passes below the cooling tubes 74 is restricted by the restricting member 106 to a position that does not overlap a plane L (see fig. 5) that passes through the cooling oil holes 82 in the longitudinal direction of the cooling tubes 74 and is perpendicular to the longitudinal direction of the cooling tubes 74.

In this manner, the portion of second harness 96 passing under cooling tube 74 is restricted to a position offset from cooling oil hole 82 in the longitudinal direction of cooling tube 74, thereby preventing cooling oil that has leaked from cooling oil hole 82 from catching on second harness 96. As a result, the cooling oil of the amount required for cooling spreads over the first rotating electrical machine MG1, and the cooling performance of the first rotating electrical machine MG1 is improved. In addition, foreign substances caused by the cooling oil moving to the connector along the second wire harness 96 are also prevented from adhering to the connector. Further, even in the case where vibration during traveling is transmitted to the second wire harness 96, relative movement of the second wire harness 96 with respect to the cooling pipe 74 in the long dimension direction is restricted.

As described above, according to the present embodiment, the second wire harness 96 passing below the cooling pipe 74 is restricted by the restricting member 106 at a position not overlapping the plane L passing through the cooling oil holes 82 and perpendicular to the long dimension direction of the cooling pipe 74, and therefore even if the second wire harness 96 is not arranged above the cooling pipe 74, the cooling oil let out from the cooling oil holes 82 is prevented from catching on the second wire harness 96. Therefore, the cooling oil discharged from the cooling oil holes 82 is efficiently supplied to the first rotating electrical machine MG1, and therefore the cooling performance of the first rotating electrical machine MG1 is improved.

Further, according to the present embodiment, the second wire harness 96 passing below the cooling pipe 74 is caught by the L-shaped restriction member 106, and the second wire harness 96 is prevented from moving below the cooling oil hole 82, so that the cooling oil is prevented from being caught on the second wire harness 96.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is also applicable to other embodiments.

For example, in the above-described embodiment, the second harness 96 connecting the sensor connector 95 of the temperature sensor that detects the temperature of the second rotating electrical machine MG2 and the second connector 98 passes below the cooling pipe 74 in the direction of the perpendicular line, and the relative movement of the second harness 96 with respect to the cooling pipe 74 in the longitudinal direction is restricted by the restricting member 106, but the present invention is not necessarily limited to the second harness 96 described above. For example, the present invention may be applied to a harness for connecting a resolver for detecting the rotation speed of the second rotating electrical machine MG2 to a connector, or in short, any harness that needs to pass through the lower portion of the cooling pipe 74.

Although the cooling pipe 74 is disposed so that the longitudinal direction thereof is parallel to the first rotation axis CL1, the present invention is not necessarily limited to being parallel thereto, and may be modified as long as the longitudinal direction of the cooling pipe 74 is disposed along the first rotation axis CL 1.

Further, in the above-described embodiment, the cooling pipe 74 is fixed to the partition wall 56 of the second case member 40b by the bolt 76, but the cooling pipe 74 may be fixed to the wall of the third case member 40c by the bolt 76.

In the above-described embodiment, the first rotating electrical machine MG1 is an inner rotor type rotating electrical machine in which the rotor 44 is disposed on the inner peripheral side of the stator 42, but may be an outer rotor type rotating electrical machine in which the rotor is disposed on the outer peripheral side of the stator. In this case, the cooling oil is exclusively supplied to the rotor.

In the above-described embodiment, the restricting member 106 is formed of an L-shaped member formed of the short side 108 and the long side 110, but the present invention is not necessarily limited to the L-shaped member. For example, any structure may be suitably used as long as it is a structure capable of catching the second wire harness 96, such as a circular or elliptical member having a cutout formed in a part in the circumferential direction for inserting the second wire harness 96.

In the above-described embodiment, the first rotating electrical machine MG1 is cooled by the cooling oil discharged from the cooling oil holes 82 of the cooling pipe 74, but the present invention is not necessarily limited to the cooling oil. In the present invention, any liquid (coolant) that can cool the first rotating electric machine MG1 may be suitably used.

The above description is only one embodiment, and the present invention can be implemented by various modifications and improvements based on knowledge of those skilled in the art.

Claims

1. A cooling device for a rotating electrical machine for a vehicle, applied to a rotating electrical machine for a vehicle accommodated in a case and arranged to include a stator and a rotor, the cooling device including a cooling pipe of a longitudinal shape arranged above the stator and the rotor in a direction of a vertical line in a vehicle-mounted state and arranged along a rotation axis of the rotor, a coolant supplied to the cooling pipe being discharged to at least one of the stator and the rotor through a coolant discharge hole formed in the cooling pipe,

the cooling pipe is provided with a restricting member that restricts relative movement of the wire passing below the cooling pipe in the longitudinal direction with respect to the cooling pipe to a position that does not overlap a plane that passes through the coolant discharge hole and is perpendicular to the longitudinal direction of the cooling pipe.

2. The cooling device of a rotating electrical machine for a vehicle according to claim 1,

the regulating member is an L-shaped member that is provided at a position that does not overlap a plane that passes through the coolant discharge hole and is perpendicular to the longitudinal direction of the cooling pipe, and that catches the wiring.